This sounds like the same old story I'm familiar with from out in Cascadia - following '99 there was an attempt to do something similar with the Association of Northwest Anarchists, which was, ostensibly, a network of autonomous groups working on projects throughout the US regions of Cascadia. In truth there was an affinity group in Seattle, one in Bellingham, I think one in the suburbs of Seattle, some individuals in both of those cities as well as Tacoma (and maybe... MAYBE Olympia), and a list serve that was not actually connected to the association officially. However, initial problems arose when some of the folks from Seattle started pushing for an organization which would somehow absorb pre-existing anarchist projects (I recall a meeting where someone proposed that Left Bank Books, the Seattle Food Not Bombs group and I think Books to Prisoners could become working groups, to which the folks involved with all were like, "ummmm - fuck you."
Later, when some folks started arguing over the nuances of which -isms should and should not be explicitly included in the statement of principles, pretty much everyone but the Seattle ag walked away.
You might be not-very-surprised to hear that some of the same names cropped up trying to start the various failed anarchist communist federations in the Pac NW in more recent years, none of which are seemingly doing anything now, though if I am wrong, I'd love to be corrected ;)
These answers and comments actually are giving me thoughts on a question that i can't quite form, so I'll crowdsource it (ick! hate that term)- I am wondering about the tension between formal membership organizations, associations of autonomous groups and individuals, and even more informal alliances. Primarily why each fails, and how we can work to prevent the latter from becoming, over time, the former (or are associations just front groups for pro-organizational/leftist entryists seeking to infiltrate the post-left/anti-organizationalist crowd), but I'd like to do it in a way that doesn't sound as snarky as all that.